The IT Stuff

Cisco IOS (originally Internetwork Operating System) is the software used on the  Cisco Systems routers and all current Cisco network switches.
IOS is a package of routing, switching, internetworking and telecommunications functions tightly integrated with a multitasking operating system.

VLANs are broadcast domains in a Layer 2 network. Each broadcast domain is like a distinct virtual bridge within the switch. Each virtual bridge you create in a switch defines a broadcast domain. By default, traffic from one VLAN cannot pass to another VLAN. Each of the users in a VLAN is also in the [...]

Exec commands can be issued from within configuration mode via the do command. This can be handy for double-checking the current configuration before applying any changes. You can now issue EXEC-level Cisco IOS commands (such as show, clear, and debug commands) from within global configuration mode or other modes by issuing the do command followed [...]

There are four major phases to the bootup process:
1. Performing the POST
2. Loading the bootstrap program
3. Locating and loading the Cisco IOS software
4. Locating and loading the startup configuration file or entering setup mode
1. Performing the POST
The Power-On Self Test (POST) is a common process that occurs on almost every computer during bootup. The POST [...]

Cisco IOS® Packaging simplifies the image selection process by consolidating the number of packages and using consistent package names across platforms.Cisco has begun repackaging all IOS versions with its new naming conventions, starting with IOS version 12.3 specifically designed for Cisco 1700, Cisco 2600XM, Cisco 2691, the Cisco 3700 Series Access Routers, and the Cisco [...]